Drivers are being urged to avoid the A10 around Foxton after reports the level crossing has broken down.
British Transport Police tweeted that engineers are en-route as traffic builds up on the road.
A Network Rail spokeswoman said: “We are aware that the barriers have failed at the crossing and our engineers will be on site as soon as possible. We are sorry for the inconvenience that this has caused and we will carry out an investigation into why this has happened.”
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